Parallel inversion progress

• Concern : API/UI

• Platform : Windows

• Problem Description : On windows there is no output displayed from parallelised inversions. I'm not sure why. However it would be nice to have a proper idea of progress. Currently on Linux the real time output for parallel inversions is output, though we may want to change this to a similar progress bar as the output from several streams is being printed to the console at once which is very confusing.

• How to reproduce it : Run batch/timelapse inversion with invert(parallel=True, forceParallel=True). The reason with forceParallel=True is we're still tinkering with the windows implementation of parallelism.